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Metals
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Microstructure, Properties and Modelling of High-Entropy Alloys
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Microstructure, Properties and Modelling of High-Entropy Alloys

A special issue of Metals (ISSN 2075-4701). This special issue belongs to the section "Entropic Alloys and Meta-Metals".

Deadline for manuscript submissions: closed (30 June 2023) | Viewed by 7050

Special Issue Editor

Dr. Francisco Gil Coury

E-Mail Website
Guest Editor
Department of Materials Engineering, Federal University of São Carlos—UFSCar, SP, São Carlos 13565905, Brazil
Interests: high-entropy alloys; Ni-based alloys; structural characterization; transmission electron microscopy; mechanical properties; materials modeling
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

The development of new materials has followed human development since the dawn of our civilization. Most metallic alloys have been developed through a relatively similar philosophy: a base metal is chosen considering its general properties, then alloying elements and a suitable processing route are selected to achieve a certain desirable balance of properties. Almost all materials we use today have been generated via this route and largely meet all requirements for the applications for which they are proposed at reasonable cost. However, some industrial sectors require extreme operating conditions, such as the oil and gas, automobile, aeronautics, naval, and aerospace industries. Therefore, there is not only space but also the need for materials that, based on innovative concepts, present unique sets of properties with the potential to revolutionize fields, enable new technologies, and generate significant improvements in the quality of life for our civilization.

In this scenario, the development of alloys using conventional methods is reaching a plateau, with the behavior of main metals following additions of the most economically viable alloying elements already well studied. High-entropy alloys (HEAs) have been changing this paradigm via the development of multicomponent alloys, several of which have very interesting mechanical and functional properties. These alloys exist over vast, mostly unexplored compositional fields, and we are only starting to unravel their true potential.

For the present Special Issue, we encourage the submission of publications focusing on the development, characterization, testing and modeling of HEAs. Works that expand our knowledge on these multicomponent alloys are highly encouraged, which can include in-depth studies or reassessments of existing compositions, modeling of known properties, predictive modeling, and the discovery of new HEA compositions with interesting combinations of properties.

Prof. Dr. Francisco Gil Coury
Guest Editor

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Metals is an international peer-reviewed open access monthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2600 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • high-entropy alloys
  • multi-principal element alloys
  • complex concentrated alloys
  • mechanical properties
  • functional properties
  • structural characterization
  • computational materials
  • alloy design

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Published Papers (3 papers)

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Research

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13 pages, 12389 KiB  
Article
First-Principles Calculation and Kink-Dislocation Dynamics Simulation on Dislocation Plasticity in TiZr-Based Concentrated Solid-Solution Alloys
by Yu Liu and Guangping Zheng
Metals 2023, 13(2), 351; https://doi.org/10.3390/met13020351 - 9 Feb 2023
Cited by 1 | Viewed by 1474
Abstract
The dislocation plasticity of TiZr-based hexagonal close-packed (HCP) concentrated solid-solution alloys (CSAs) is investigated using a multiscale simulation approach combining the first-principles calculation and Frenkel–Kontonova kink-dislocation model. The first-principles calculation reveals that dislocation-mediated slip is significantly enhanced by the additions of Y and [...] Read more.
The dislocation plasticity of TiZr-based hexagonal close-packed (HCP) concentrated solid-solution alloys (CSAs) is investigated using a multiscale simulation approach combining the first-principles calculation and Frenkel–Kontonova kink-dislocation model. The first-principles calculation reveals that dislocation-mediated slip is significantly enhanced by the additions of Y and Sc in TiZrHf CSAs. The dislocation kinetics is simulated using the kink-dislocation model at mesoscopic scales, and the predicted mechanical strength of CSA is found to be consistent with experimental results. In addition to predicting the mechanical properties of CSAs accurately, the multiscale simulation approach elucidates the deformation mechanisms in CSAs at atomic scales, suggesting that the approach is robust in modeling the dislocation plasticity of CSAs. Full article
(This article belongs to the Special Issue Microstructure, Properties and Modelling of High-Entropy Alloys)
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14 pages, 10981 KiB  
Article
Development of Refractory High Entropy Alloys with Tensile Ductility at Room Temperature
by Zhangquan Liu, Xiaohui Shi, Min Zhang and Junwei Qiao
Metals 2023, 13(2), 329; https://doi.org/10.3390/met13020329 - 6 Feb 2023
Cited by 4 | Viewed by 1680
Abstract
In this study, a low-cost refractory high-entropy alloy (RHEA) with obvious macroscopic tensile ductility was designed. The evolution of the microstructures and fundamental mechanical properties with the TiZr concentration in arc-melted (TiZr)x(NbTaV)1−x (x = 0.4, 0.6, and 0.8) [...] Read more.
In this study, a low-cost refractory high-entropy alloy (RHEA) with obvious macroscopic tensile ductility was designed. The evolution of the microstructures and fundamental mechanical properties with the TiZr concentration in arc-melted (TiZr)x(NbTaV)1−x (x = 0.4, 0.6, and 0.8) high-entropy alloys (HEAs) were investigated. The alloys (TiZr)0.4(NbTaV)0.6 and (TiZr)0.6(NbTaV)0.4 had a single body-centered cubic solid solution phase. Two phases were confirmed in the as-cast (TiZr)0.8(NbTaV)0.2 alloy using X-ray diffraction and scanning electron microscopy. All three alloys had dendritic structures with severe element segregation. (TiZr)0.4(NbTaV)0.6 had a high yield strength of 1300 MPa with a compressive fracture strain of 16%. (TiZr)0.8(NbTaV)0.2 showed exceptional compressive plasticity but a low yield strength. (TiZr)0.6(NbTaV)0.4 had a relatively uniform yield strength and compressive fracture plasticity (950 MPa and 35%). In addition, (TiZr)0.8(NbTaV)0.2 also had a tensile ductility of 7% at room temperature. Full article
(This article belongs to the Special Issue Microstructure, Properties and Modelling of High-Entropy Alloys)
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Review

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15 pages, 3457 KiB  
Review
WC-Based Cemented Carbides with High Entropy Alloyed Binders: A Review
by Boris Straumal and Igor Konyashin
Metals 2023, 13(1), 171; https://doi.org/10.3390/met13010171 - 14 Jan 2023
Cited by 15 | Viewed by 3263
Abstract
Cemented carbides have belonged to the most important engineering materials since their invention in the 1920s. Commonly, they consist of hard WC grains embedded in a cobalt-based ductile binder. Recently, attempts have been made to substitute the cobalt using multicomponent alloys without a [...] Read more.
Cemented carbides have belonged to the most important engineering materials since their invention in the 1920s. Commonly, they consist of hard WC grains embedded in a cobalt-based ductile binder. Recently, attempts have been made to substitute the cobalt using multicomponent alloys without a principal component (also known as high entropy alloys—HEAs). HEAs usually contain at least five components in more or less equal amounts. The substitution of a cobalt binder with HEAs can lead to the refinement of WC grains; it increases the hardness, fracture toughness, corrosion resistance and oxidation resistance of cemented carbides. For example, a hardness of 2358 HV, fracture toughness of 12.1 MPa.m1/2 and compression strength of 5420 MPa were reached for a WC-based cemented carbide with 20 wt.% of the equimolar AlFeCoNiCrTi HEA with a bcc lattice. The cemented carbide with 10 wt.% of the Co27.4Cr13.8Fe27.4Ni27.4Mo4 HEA with an fcc lattice had a hardness of 2141 HV and fracture toughness of 10.5 MPa.m1/2. These values are higher than those for the typical WC–10 wt.% Co composite. The substitution of Co with HEAs also influences the phase transitions in the binder (between the fcc, bcc and hcp phases). These phase transformations can be successfully used for the purposeful modifications of the properties of the WC-HEA cemented carbides. The shape of the WC/binder interfaces (e.g., their faceting–roughening) can influence the mechanical properties of cemented carbides. The most possible reason for such a behavior is the modification of conditions for dislocation glide as well as the development and growth of cracks at the last stages of deformation. Thus, the substitution of a cobalt binder with HEAs is very promising for the further development of cemented carbides. Full article
(This article belongs to the Special Issue Microstructure, Properties and Modelling of High-Entropy Alloys)
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